655991515 has 8 divisors (see below), whose sum is σ = 787469328. Its totient is φ = 524606880.

The previous prime is 655991477. The next prime is 655991519. The reversal of 655991515 is 515199556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 655991515 - 2⁹ = 655991003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655991519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6732 + ... + 36841.

It is an arithmetic number, because the mean of its divisors is an integer number (98433666).

Almost surely, 2^655991515 is an apocalyptic number.

655991515 is a deficient number, since it is larger than the sum of its proper divisors (131477813).

655991515 is a wasteful number, since it uses less digits than its factorization.

655991515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46589.

The product of its digits is 303750, while the sum is 46.

The square root of 655991515 is about 25612.3313073996. The cubic root of 655991515 is about 868.8925509053.

The spelling of 655991515 in words is "six hundred fifty-five million, nine hundred ninety-one thousand, five hundred fifteen".